Insertion of an intrauterine contraceptive device after induced or spontaneous abortion: a review of the evidence

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Abstract

Objective Assess the safety and efficacy of intrauterine contraceptive device (IUCD) insertion immediately after induced or spontaneous abortion.

Design Systematic search for randomised trials that had at least one treatment arm that involved IUCD insertion immediately after an induced or spontaneous miscarriage using Medline, Popline, EMBASE, and review articles supplemented by correspondence with investigators.

Population Women of any age or gravidity who had an IUCD inserted immediately after evacuation for spontaneous or induced abortion.

Methods Articles were abstracted and the raw data from tables were analysed with RevMan 3.1 software. We focused on Tietze-Potter gross life table probabilities with denominators of person-time of exposure.

Main outcome measures Rates of perforation, expulsion, pelvic inflammatory disease, contraceptive failure, and method continuation.

Results Complication rates for immediate post-abortal IUCD insertion were low. Perforation was rare with a rate of approximately one per 1000 insertions. One year gross cumulative expulsion rates ranged from 1.8% to 12.6%, pregnancy rates from 0.6% to 2.1%, and continuation rates from 54% to 90%. The net discontinuation rate due to pelvic inflammatory disease was low, ranging from 0.0 to 0.8 per 100 women at one year. Increasing gestational age at insertion was associated with increased expulsion rates.

Conclusions Post-abortal IUCD insertion is safe and effective. The risks of perforation, expulsion, pelvic inflammatory disease and contraceptive failure were low and similar to those reported for interval insertion. Second trimester gestational age is associated with an increased risk of expulsion. Immediate insertion may have a higher expulsion rate than delayed insertion. However, these risks may be outweighed by the benefit of immediate contraception.

Introduction

For those women who choose an intrauterine contraceptive device (IUCD) as their post-abortal method of contraception, immediate insertion has many benefits compared with later insertion. Ovulation returns soon after abortion, with half of women ovulating by 21 days after the procedure1. Immediate post-abortal insertion provides immediate contraceptive protection. Furthermore, the woman avoids the potential inconvenience, discomfort and bleeding of a separate insertion procedure. Finally, her motivation for contraception is often high.

However, clinicians have feared that rates of IUCD perforation and expulsion may be higher in the post-abortal uterus due to its softness and enlargement. Immediate post-abortal IUCD insertion may increase the risk of upper genital tract infection after abortion. Finally, the contraceptive efficacy of the IUCD after post-abortal insertion and the method continuation rate are unclear. The purpose of this review was to assess the safety and efficacy of immediate post-abortal IUCD insertion.

Section snippets

METHODS

We performed a systematic search of the literature for randomised controlled trials that had at least one treatment arm that involved IUCD insertion immediately after an induced or spontaneous abortion using Medline, Popline, the Cochrane Controlled Trials Register and EMBASE, complemented by review articles and contacts with the investigators. We used the following key word combinations: (post-abortal IUCD insertions or IUD or IUCD or intrauterine devices) and (post-abortion or post-abortal or

Results

Eight trials met our inclusion criteria (Table 1). Overall, the two WHO studies were the largest and best, with 4476 woman-years of data6., 11.. They used standardised definitions and explicit reporting of outcomes. They reported their results in net (competing) cumulative rates. Each trial compared three devices (TCu 220C, Lippes Loop D, Copper 7), the first in the setting of insertion after induced surgical abortion6, the second after curettage for miscarriage11. We derived the following

Discussion

Post-abortal IUCD insertion is both safe and effective. The absolute rates of perforation, expulsion, upper genital tract infection, contraceptive failure and method discontinuation were all low. These rates are comparable to those reported for interval IUCD insertion with modern copper devices18., 19., 20., 21., 22., 23.. Overall, devices with copper had lower pregnancy rates than those without copper, and devices with a ‘T’ shape had lower expulsion rates compared with other shapes. The risk

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